At home parties, in office pools, or in Nevada, millions of American who otherwise don’t gamble will be placing a wager on the No. 1 event in America’s No. 1 sport – despite a 1992 federal law that bans sports betting in almost every state.

Most bets are not made on the athletics but on so-called propositions, such as which team will win the coin toss, how long it will take Carrie Underwood to sing the National Anthem, or whether Peter Townshend, leader of the rock band The Who, will smash his guitar during the half-time show.